/*
 * Copyright (c) 2013, SRI International
 * All rights reserved.
 * Licensed under the The BSD 3-Clause License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 * 
 * http://opensource.org/licenses/BSD-3-Clause
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the aic-web-praise nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.sri.ai.lpitools.executionengine.interfaces.implementations;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.Vector;

import java.util.logging.Logger;
import org.apache.xmlrpc.XmlRpcException;
import org.apache.xmlrpc.client.XmlRpcClient;
import org.apache.xmlrpc.client.XmlRpcClientConfigImpl;

import com.sri.ai.lpitools.cobra.gwtutil.dataobjects.shared.LWPException;
import com.sri.ai.lpitools.executionengine.interfaces.api.ExecutionEngineInterface;


public class RPCExecutionEngineInterfaceImpl implements ExecutionEngineInterface{

	private XmlRpcClient client;
	private String url;
	private static final Logger logger = Logger.getLogger(RPCExecutionEngineInterfaceImpl.class.getName());	
	
	public RPCExecutionEngineInterfaceImpl()
	{
		logger.info("In RPCExecutionEngineInterfaceImpl");
//		this.url = "http://127.0.0.1:8099";
//		try {
//			setUpClient(url);
//		} catch (MalformedURLException e) {
//			logger.info("Error: the URL for the server is malformed: " + url);
//		}
	}
	
	public RPCExecutionEngineInterfaceImpl(String url)
	{
		url = "http://" + url;
		try {
			setUpClient(url);
		} catch (MalformedURLException e) {
			logger.info("Error: the URL for the server is malformed: " + url);
		}
	}
	
	/*
	 * (non-Javadoc)
	 * @see com.sri.ai.lpitools.executionengine.interfaces.api.ExecutionEngineInterface#setUp(java.lang.String)
	 */
	@Override
	public void setUp(String url) {
		
		logger.info("In RPCExecutionEngineInterfaceImpl setup");
		this.url  = "http://" + url;
		try {
			setUpClient(this.url);
		} catch (MalformedURLException e) {
			logger.info("Error: the URL for the server is malformed: " + this.url );
		}
	}
    /**
     * Function to set up a client with given server url
     * @param serverURL
     * @throws MalformedURLException
     */
	private void setUpClient(String url) throws MalformedURLException{
	    //set up client with given url
		XmlRpcClientConfigImpl config = new XmlRpcClientConfigImpl();
		config.setServerURL(new URL(url));
		client = new XmlRpcClient();
		client.setConfig(config);		
	}
	


	/*
	 * (non-Javadoc)
	 * @see com.sri.ai.lpitools.executionengine.interfaces.api.ExecutionEngineInterface#checkModelByModel(java.lang.String, java.lang.String)
	 */
	@Override
	public boolean checkModelByModel(String model) throws LWPException {
		Object resultCall = null;
		
		try {
			Vector<String> param = new Vector<String>();		
			param.add(model);
			resultCall = client.execute("ExecutionEngine.checkModelByModel", param);

		} catch (XmlRpcException e) {
			logger.info("Error could not connect to a server" + url +" with the following error " +  e.toString());
			throw new LWPException("Error could not connect to a server" + url +" with the following error " +  e.toString());
		}	
		
		//if we get something back check what the result was
		//if we get result then check what it is
		if(resultCall  != null){
			return (Boolean) resultCall;
		} else {
			throw new LWPException("Error got a null String back");
		}
	}

	/*
	 * (non-Javadoc)
	 * @see com.sri.ai.lpitools.executionengine.interfaces.api.ExecutionEngineInterface#runQuery(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String)
	 */
	@Override
	public String runQuery(String user, String model, String evidenceTitle, String queryTitle, String clientID, String queryOptionsJSON, String url) throws LWPException  {
		Object resultCall = null;
		String result = null;
		
		try {
			logger.info("Client " + clientID + " is running query against " + model );
			Vector<String> param = new Vector<String>();
			param.add(user);
			param.add(model);
			param.add(evidenceTitle);
			param.add(queryTitle);
			param.add(clientID);
			param.add(queryOptionsJSON);
			param.add(url);
			resultCall = client.execute("ExecutionEngine.runQueryByKey", param);
		} catch (XmlRpcException e) {
			logger.info("Could not run query got the following XmlRpcException " +  e.toString());
			throw new LWPException("Error could not connect to a server" + url +" with the following error " +  e.toString());
		}

	
		
		//if we get something back check what the result was
		//if we get result then check what it is
		if(resultCall  != null){
			String returnedString = (String) resultCall;
			result = returnedString;
			return result;
		}
		else{
			throw new LWPException("Error got a null String back");			
		}
		
	}

	/*
	 * (non-Javadoc)
	 * @see com.sri.ai.lpitools.executionengine.interfaces.api.ExecutionEngineInterface#getID()
	 */
	@Override
	public String getID() throws LWPException {
		Object resultCall = null;
		String result = null;
		
		try {
			Vector<String> param = new Vector<String>();
			resultCall = client.execute("ExecutionEngine.getUniqueID", param);

		} catch (XmlRpcException e) {
			logger.info("Error could not connect to a server" + url +" with the following error " +  e.toString());
			throw new LWPException("Error could not connect to a server" + url +" with the following error " +  e.toString());
		}	
		
		//if we get something back check what the result was
		//if we get result then check what it is
		if(resultCall  != null){
			String returnedString = (String) resultCall;
			result = returnedString;
			return result;
		}
		else{
			throw new LWPException("Error got a null String back");
		}
	
	}

}
